Configuring the Switch
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3
Web – Click Priority, ACL CoS Priority. Enable mapping for any port, select an ACL
from the scroll-down list, then click Apply.
Figure3-81 ACL CoS Priority
CLI – This example assigns a CoS value of zero to packets matching rules within
the specified ACL on port 24.
Changing Priorities Based on ACL Rules
You can change traffic priorities for frames matching the defined ACL rule. (This
feature is commonly referred to as ACL packet marking.) This switch can change the
IEEE 802.1p priority, IP Precedence, or DSCP Priority of IP frames; or change the
IEEE 802.1p priority of Layer 2 frames.
Command Usage
• You must configure an ACL mask before you can change priorities based on a rule.
• Traffic priorities may be included in the IEEE 802.1p priority tag. This tag is also
incorporated as part of the overall IEEE 802.1Q VLAN tag. The 802.1p priority may
be set for either Layer 2 or IP frames.
• The IP frame header also includes priority bits in the Type of Service (ToS) octet.
The Type of Service octet may contain three bits for IP Precedence or six bits for
Differentiated Services Code Point (DSCP) service. Note that the IP frame header
can include either the IP Precedence or DSCP priority type.
• The precedence for priority mapping by this switch is IP Precedence or DSCP
Priority, and then 802.1p priority.
Console(config)#interface ethernet 1/24 4-123
Console(config-if)#map access-list ip bill cos 0 4-98
Console(config-if)#